Process for drying artificial stone or wet molds.



Y s. DAVIDsoN. PROCESS POR DEYING ARTIFICIAL STONE 0R WET MOLDS.APPLICATION FILED OOTJB, 19];1. RENEWED AUG, 7, 1913.

s mm 7//////////////7////////////////////////////////////////////Patented Mar. 17, 1914.

PROCESS FDR DRYING ARTIFICIAL STONE 0R WET MOLDS.

APPLICATION FILED OQTJB, 1911. EENEWBD AUG. "l, 1913.

,Patent-.s Mar.17,1914.

' 2 SHEETS-SHEET 2.

A Tron/Vf? fitting arms in a detachable manner to the stop cock 26 is.preferably a vacuum hose 31 and connected tothe stop cock 27 ispreferably a pressure hose 32.

In the form shown in Fig. 5, I preferably secure to the outer end of thepipe 23 a .Tv 33 tol which is secured by suitable stop cocks 34 and 35provided with 36` and 37, respectively. These arms are connectedtogether by means of the link 38. Secured in a detachable manner to thestop cock .34 is a vacuum hose 39 and secured ina like manner to thestop cock is a pressure hose 40.

lReferring now to Fig. 7 where I show a modified form -of connection, 41represents a rotary pump and connecting the pressure side thereof withthe filter pipe 42 is a suitl able pipe 43.. In 'this pipe 11s athree-way stop cock 45 and -a three-way stop cock 44, having arranged`atits branch, an air dispipes,

charge pipe 61. .The 'stop cock 45 is nearest Pip rotary Pump the flask10 and it has a steam pipe 46 connected tothe branch thereof. 47represents a fragmental plan of a steam boiler and connecting it to thesteam pipe 46 is a line of e 48 in which is preferably placed a valve49. Connecting the suctionside of the 41 with the filter pipe50 is asuitable plpe 51 and in this pipe is placed a stop cock 52and aT fitting53.- Running from the branch of the T 53.is` pipe 54, in 55. 56represents which is when e left an air heater of any suitable styleconnected withA the pipe 54. Obviousl cold air is desired, the heatermay coldnd air may -same without being arms of the stop cocks 44 and 551s a link 58, whereb ,the stop cocks connected by these links may beoperated in unison.

In Figs. 8 and 9 I have shown a modiedA form 'of filter and connectionthereto. Here I: use a plurality of hose shaped` fabrlc liltes 14 'mold12 and two beneath the same. 59 is e a'manifold 'and may extend alongany numberA of molds and have a vacuum and pres' sureconnection thereto.

of the 'filters 14 with this manifo d are suitable detachableconnections 6 When carrying out my vices 'herein shown and processdescribed, I mold the attern for the artificial stone and cast the uidconcrete mixture in the usual manner but while molding the pattern-Iinsert the fabric filter in the in the device shown -in Fig. 5 -andFig.6,

where the filter 14 remains stat1onary. Referring now moreparticularlyj'to 1,'after the cement mixture'has been :poured fV thevvacuum hose 3111s connected to any suit-l able source for drawing avacuum'andV the pressure hose 32 is connected preferably to any suitablesource of stggmupplm The be drawn throughr the heated. Connecting theyisposed onev on each side of the 4Conneetin each by the 4desand as ishownexcept A link 30 is now nioved to the position shown in Fig. 1,when the lstop cock 26 is open'and the stop cock 27 is closed. Thefilter. 14 will now -be evacuated and some of the moisture in thesandwill be drawnoif. The stop cocks are held in this position for avery short tine only when the link 30 is moved so as to open the steamstop cock 27 and close the vvacuum stop cock 26. The steam now entersthe filter, blowing out the sand that has beendrawn into. the fabric inthefllter land heats the sand and concrete mixture'and causes themoisture therein to become vaporized. The steam is applied for a veryshort time when it is shut off and the vacuum stop cock 26 is againopened, whereupon the said vapor from the sandand concrete mixture willbe drawn off. This operation is repeated in; quick `succession until theconcrete mixture becomes skin or surface dried. After, the concrete hasbecome skin dried the sand -isremoved from around the concrete and thesame is allowed to air dry While I havedescribed the operation of thedevice shown in Fig. 1"it fwill be understood that this operation issimilar to that of all the forms shown except that of the one shownfinFig. 7.' Obviously, in .place lo-: using steam to .clean the filter,heatedl air or even cold air'unfder pressure may be used. This is moreclearly shown in Fig. 7 and vthe operation of'the\device there shown isl as follows: The stop cocks as shown are so arranged that when t e pump41 is revolved,

air either heated o coldwill be drawn through the pipe 54, stop cock 55,T 53,

pipe 51, pump 41, pipe 43, stop cocks 44 and 4 5 and into, the filter14. When starting my process with the device shown in this ligure, I`operaten the link 58so as to close stop cock 55vand move lstop cock 44to a pos ition where the air inthe pipe 43l will be' ies discharged frompipe 61 .and I also open 'y stop' cock 52. With the stop 4cocks set asjust described, air will be drawn from the lterfand mold and through theElter'pipe 50, stopcock 52, pipe 51, pump 41, ipe 43,

, stop cock/44 and discharged. from t e pipe 61'. When it 'is desired'touse steaminstead of coldor heated air,',thestop'.c ock 52 is closed andthe three-way stop cock 45` operated so that steamwillbe carried fromthe ppel46 to the 'pipe42 andthe filter it f i connected thereto.

Inthe drawings, I' have1 shown devices with single-part flasks only, butobviously,

my process may be carried out with a'; mu1` tiple-part ask and thefilters may be placed in lany partgof- -the flask4 desired. The con.

nections from .the filters 'tofthestqp cocks or4 manifolds may beeither' of pipe 'or of rubber hose and many 'other vmodifications lfr om'the devicesherein `shown and described may be made' withoutdepartingfromthe spirit' of-my invention. 1

iso

moisture from-said stone into the mo ding Sand, then extracting chanicalmeans,

. Obviously, while rI show process as used in drying articial stone andarticial stone molds, 1t may be used to great advantageli'n skindryinbrass, iron and steel vmolds which isy in t the appended claims.r daving thus described my invention, what I claimis': v v.

' 1. The process of drying articial stone or wet molds which consists iniilterin the sand and then extracting said moisture from i' f saidmolding sand through a filter by me- Y chanical means. Y -2. The processof drying artificial stone or wet: molds which `consists inffilterinmoisture from said stone into .the mo ding said moisture from saidmoldingsand through a filter b .me-

andthei) forcing `a imd unand des-rite myl e scope of moisture from/saidstone into the molding der pressure into said lter said sand, wherebyIsaid ilt'erl is kept clean and free from cloggin deposits. v

3. The rprocess of dgrying artificial stone or wet molds which consistsinliltering the sand, .then extracting said moisture from saidmoldingsand through a filter by mechanical means, and then forcing a heatedHuid under pressure into said filter and through said sand whereby themoisture is vaporlzed and the said filter isA kept clean and free fromcloggin deposits.

In testimony whereo I have hereunto set my hand in the presence of twosubscribmg witnesses.

I ,SAMUEL DAVIDSON.

Wissbm I J: WM.'

and through

